Jumping Jacks and Sore Calves


It didn't used to hurt. Then it started to hurt like heck. Now it hurts less...but still hurts towards the end of an interval. What am I doing wrong in my jumping jack form that is causing my calves-ankles to hurt so much? I've been working out w FB 5 days per week since late August...somewhere around late September it was very painful...then I seemed to get stronger and it hurt less....but the pain is still there - it is more or less isolated to the set, meaning I don't feel it later in the day or during other exercises. How should I be jumping, Jack?